Check the listing for details. 130BCD Bike Chainring 39T Round Narrow Wide Single Chainring for Road Bike. Condition: New. Listed at 18.98 USD. 1. Constructed from high-strength aluminum alloy through precision CNC machining, this material offers an excellent strength-to-weight ratio, ensuring a durable chainring.2. Designed with sharp-edged teeth to securely engage the chain, enhancing riding efficiency and minimizing wear for a smoother ride. The innovative tooth profile ensures precise shifting and reduces the risk of chain slippage, even under rigorous cycling conditions.3. Specifically designed for road bikes, this chainring enhances overall riding performance and meets diverse cycling needs across a variety of riding conditions. It supports 9, 10, and 11-speed chains, offering exceptional versatility for modern road cycling.4. Ensure the crankset matches before buying to prevent problems. Mismatched parts may cause performance issues or damage.1. Constructed from high-strength aluminum alloy through precision CNC machining, this material offers an excellent strength-to-weight ratio, ensuring a durable chainring.2. Designed with sharp-edged teeth to securely engage the chain, enhancing riding efficiency and minimizing wear for a smoother ride. The innovative tooth profile ensures precise shifting and reduces the risk of chain slippage, even under rigorous cycling conditions.3. Specifically designed for road bikes, this chainring enhances overall riding performance and meets diverse cycling needs across a variety of riding conditions. It supports 9, 10, and 11-speed chains, offering exceptional versatility for modern road cycling.4. Ensure the crankset matches before buying to prevent problems. Mismatched parts may cause performance issues or damage.